Reshape crashes due to wrong size in release builds

[dragly]

Running the reshape example as a test fails in release mode.

Steps to reproduce

Append the following to test/array.rs:

#[test]
fn reshape() {
    Python::with_gil(|py| {
        let array = PyArray::from_iter(py, 0..9)
            .reshape_with_order([3, 3], NPY_ORDER::NPY_FORTRANORDER)
            .unwrap();

        assert_eq!(
            array.readonly().as_array(),
            array![[0, 3, 6], [1, 4, 7], [2, 5, 8]]
        );
        assert!(array.is_fortran_contiguous());

        assert!(array.reshape([5]).is_err());
    });
}

Run the following command:

cargo test --release reshape

Output:

thread 'reshape' panicked at 'called `Result::unwrap()` on an `Err` value: PyErr { type: <class 'ValueError'>, value: ValueError('cannot reshape array of size 9 into shape (140325372964848,9)'), traceback: None }', tests/array.rs:554:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Workaround

My guess is that something goes wrong when pointing to memory that perhaps is optimized out in release mode.

The following workaround "fixes" the issue:
src/array.rs:

    pub fn reshape_with_order<'py, ID: IntoDimension>(
        &'py self,
        dims: ID,
        order: NPY_ORDER,
    ) -> PyResult<&'py PyArray<T, ID::Dim>> {
        let dims = dims.into_dimension();
        let mut dims = dims.to_npy_dims();

It also seems like other tests are failing in release mode.

System information

Reproduced with

• Ubuntu 20.04
• Rust 1.63 and 1.57
• NumPy 1.23 and 1.20
• Python 3.10 and 3.8

[adamreichold]

Thanks for reporting! I can confirm the issue and the fix. It also affects resize. I will prepare a 0.17.1 release with a fix.

Since this is a memory safety issue, I wonder whether we should yank 0.17.0 from crates.io? cc @davidhewitt

[adamreichold]

(We should probably add tests running under ASAN to the repository with all the unsafe code. Too bad Miri cannot be expected to handle our FFI interactions.)

[davidhewitt]

Was this a new bug in 0.17.0? Seems reasonable to yank if so once 0.17.1 released. Do you need me to do that?

[adamreichold]

Was this a new bug in 0.17.0? Seems reasonable to yank if so once 0.17.1 released. Do you need me to do that?

Yes, this was introduced during copy-editing and hence is new in 0.17.0. I have not tried yanking and will message you if it fails. Here, I first wanted to know your opinion/advice whether yanking is reasonable response.

[davidhewitt]

0.17.1 released and 0.17.0 yanked.

[dragly]

Great! Thanks for the incredibly rapid response and fix! :)